In the anime "Death Note," Light Yagami often manipulates evidence and crime scenes to create a false narrative that benefits his plans. By altering evidence or staging crime scenes, Light manages to mislead investigators, frame others for his actions, and maintain his facade as an upstanding citizen while continuing his activities as the vigilante Kira. This manipulation allows him to control the narrative surrounding the mysterious deaths attributed to Kira and evade suspicion, ultimately aiding him in his pursuit of creating a new world order based on his ideals.